Dispersal ability and parasitization performance of egg parasitoid Trichogramma evanescens westwood (Hymenoptera : Trichogrammatidae) in field and storage conditions


AYVAZ A. , Karasu E., KARABÖRKLÜ S., Yılmaz S.

TURKISH JOURNAL OF BIOLOGY, cilt.32, ss.127-133, 2008 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 32 Konu: 2
  • Basım Tarihi: 2008
  • Dergi Adı: TURKISH JOURNAL OF BIOLOGY
  • Sayfa Sayıları: ss.127-133

Özet

Özet: Bu çal›flmada yumurta parazitoidi Trichogramma evanescens’in sal›verilme noktas›ndan farkl› uzakl›klardaki parazitleme yetene¤i araflt›r›lm›flt›r. M›s›r ve asma bitkilerinin her ikisinde de sal›verme noktas›ndan uzaklaflt›kça parazitleme miktar›n›n azald›¤› görülmüfltür. Depo koflullar›nda en yüksek parazitleme oran› sal›verme noktas›nda gözlenmifl ve sal›verme noktas›ndan daha yüksek mesafelerde parazitleme azalm›flt›r. Parazitoid yo¤unlu¤u artt›kça parazitleme miktar›nda da art›fl olmufltur. Kullan›lan parazitoid say›s› 1000 oldu¤unda parazitleme oran› % 11,41 olarak hesaplanm›flken, 2000 ve 3000 parazitoid sal›verildi¤inde bu oran s›ras›yla % 29,75 ve % 62,06 olarak bulunmufltur. Yine depo koflullar›nda içerisinde un bulunan plastik kovalar kullan›ld›¤›nda parazitoid yo¤unlu¤una ba¤l› olarak konukçu ergin ç›k›fl›nda kontrole göre önemli bir azalma görülmüfl ve 500 adet parazitoid sal›verildi¤inde kontrolün % 22,86’s› kadar konukçu ergin ç›k›fl› gözlemlenmifltir.
Abstract: In this study we evaluated the dispersal ability of Trichogramma evanescens in field and storage conditions. In field studies we tested the effects of plant structure on the dispersal ability of T. evanescens from release points. Both in a corn field and on grapevines the level of parasitism was negatively correlated with distance when the host eggs were located away from the release point. The parasitization rate on grapevines and corn plants at the release point was greater than that away from the release point. Parasitization rates were significantly higher at the highest wasp density in cages. When 1000 wasps were released, the percentage of parasitized host eggs was 11.41%, and this rate increased to 29.75% and 62.06% when 2000 and 3000 wasps, respectively, were released. A similar trend was observed in plastic bags and increasing parasitoids caused a reduction in adult pest emergence.